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/*
* Interface for AEAD modes
* (C) 2013 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_AEAD_MODE_H__
#define BOTAN_AEAD_MODE_H__
#include <botan/cipher_mode.h>
namespace Botan {
/**
* Interface for AEAD (Authenticated Encryption with Associated Data)
* modes. These modes provide both encryption and message
* authentication, and can authenticate additional per-message data
* which is not included in the ciphertext (for instance a sequence
* number).
*/
class BOTAN_DLL AEAD_Mode : public Cipher_Mode
{
public:
bool authenticated() const override { return true; }
/**
* Set associated data that is not included in the ciphertext but
* that should be authenticated. Must be called after set_key
* and before finish.
*
* Unless reset by another call, the associated data is kept
* between messages. Thus, if the AD does not change, calling
* once (after set_key) is the optimum.
*
* @param ad the associated data
* @param ad_len length of add in bytes
*/
virtual void set_associated_data(const byte ad[], size_t ad_len) = 0;
template<typename Alloc>
void set_associated_data_vec(const std::vector<byte, Alloc>& ad)
{
set_associated_data(&ad[0], ad.size());
}
/**
* Default AEAD nonce size (a commonly supported value among AEAD
* modes, and large enough that random collisions are unlikely).
*/
size_t default_nonce_size() const override { return 12; }
/**
* Return the size of the authentication tag used (in bytes)
*/
virtual size_t tag_size() const = 0;
};
/**
* Get an AEAD mode by name (eg "AES-128/GCM" or "Serpent/EAX")
*/
BOTAN_DLL AEAD_Mode* get_aead(const std::string& name, Cipher_Dir direction);
}
#endif
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